Actuators; Connections At The Customer Terminal Block - Carrier Touch Pilot Manual

Motor temperature sensor
This sensor is used to control the motor temperature of each
compressor.
Temperature setpoint reset sensor (EMM)
This 4-20 mA space temperature sensor can be installed
remotely from the unit. It is used to reset the setpoint on the
unit.
Master/slave water sensor (optional)
The. water. temperature. sensor. is. used. for. master/slave.
assembly control.

3.7 - Actuators

Water pumps
The controller can regulate one condenser pump as well as
one.or.two.evaporator.pumps.and.takes.care.of.the.automatic.
changeover.between.these.pumps.(units.with.two.pumps.only).
Electronic Expansion Valve
The.electronic.expansion.valve.(EXV).is.used.to.adjust.the.
refrigerant.flow.to.changes.in.the.operating.conditions.of.the.
machine..To. adjust. the. refrigerant. flow,. a. piston. moves.
constantly. up. or. down. to. vary. the. cross-section. of. the.
refrigerant. path..This. piston. is. driven. by. an. electronically.
controlled linear stepper motor. The high degree of accuracy
with.which.the.piston.is.positioned.provides.precise.control.
of.the.refrigerant.flow.
Water flow switch
The.water.flow.switch.configuration.allows.for.the.automatic.
control.of.the.minimum.water.flow.setpoint.of.the.water.flow.
switch..The. configuration. depends. on. the. unit. size. and. is.
made automatically at the start-up. If the measured water
flow.rate.in.the.water.loop.is.lower.than.the.configured.flow.
rate, the alarm condition shuts off the unit.

3.8 - Connections at the customer terminal block

Connections.available.at.the.user.terminal.block.may.vary.
depending on the selected options.
IMPORTANT: Some contacts can be accessed only when
the unit operates in Remote mode.
3.8.1 - Terminal block connections
The following table summarizes connections at the user
terminal block.
Description
Remote on/off contact
Remote setpoint contact
Demand limit contact
Remote heat/cool contact
Alarm relay
Running relay
Occupancy override
Demand limit contact 2
Customer interlock
Ice done contact
Unit partially shutdown
Unit shut down
Board Connector
SIOB, cir A DI-01; 32-33
SIOB, cir A DI-02; 65-66
SIOB, cir A DI-03; 63-64
SIOB, cir A DI-04; 73-74
SIOB, cir A DO-05; 30A-31A
SIOB, cir A DO-06; 37-38
SIOB, EMM DI-01; 77-78
SIOB, EMM DI-02; 73A-74A
SIOB, EMM DI-03; 34A-35A
SIOB, EMM DI-04; 75-76
SIOB, EMM DO-05; 30B-31B
SIOB, EMM DO-06; 30-31
3.8.2 - Volt-free contact (on/off and cooling/heating)
On/off contacts and cooling/heating contacts are as follows:
Off
On/Off contact open
Cooling/Heating contact open
Off: Unit is stopped
Cooling: Unit is allowed to start in Cooling
Heating: Unit is allowed to start in Heating
3.8.3 - Volt-free setpoint selection contact
When.the.unit.is.under.remote.control,.the.volt-free.contact.
is.used.to.determine.the.active.setpoint..This.dry.contact.is.
used to switch between setpoints.
Setpoint
Cooling
contact
CSP1
SP_SW open
csp = cooling setpoint
hsp = heating setpoint
3.8.4 - Volt-free demand limit selection contact
Up to two dry contacts can be used to limit unit capacity
(LIM_SW1 and LIM_SW2). The second contact (LIM_SW2)
is. available. only. for. units. with. the. energy. management.
module (EMM).
Capacity limitation with two contacts is as follows:
Demand limit 1 contact
(LIM_SW1)
Demand limit 2 contact
(LIM_SW2)
3.8.5 - Ice storage (EMM)
For units with EMM option, the control includes an additional
setpoint ("ice setpoint") used for ice storage control.
Cooling setpoint
CSP1
Occupancy schedule occupied
Ice done switch open/closed
csp = cooling setpoint
ice_stp = ice setpoint
Remarks
Used for the unit on/off control if the unit is in Remote mode
Used to control the setpoint
Used to control demand limit
Used to select heat/cool mode
Indicates alarms
Indicates if the unit is ready to start or operating
Enables to switch between occupied (closed contact) and unoccupied
mode (open contact)
Used to control demand limit
Used for the customer safety loops
Used for ice storage control
Indicates the shutdown of one of the circuits
Indicates the unit shutdown
Cooling Heating
closed closed
open closed
Active setpoint
Heating
CSP2 HSP1
close open
100% Limit 1 Limit 2
open closed open
open open closed
CSP2 ICE_STP
unoccupied unoccupied
closed open
HSP2
close
Limit 3
closed
closed
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